sys/kern/subr_evcnt.c

   1 /* $NetBSD: subr_evcnt.c,v 1.5 2009/03/21 13:06:39 ad Exp $ */
   2
   3 /*
   4  * Copyright (c) 1996, 2000 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *          This product includes software developed for the
  18  *          NetBSD Project.  See http://www.NetBSD.org/ for
  19  *          information about NetBSD.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )--
  35  */
  36
  37 /*
  38  * Copyright (c) 1992, 1993
  39  *      The Regents of the University of California.  All rights reserved.
  40  *
  41  * This software was developed by the Computer Systems Engineering group
  42  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  43  * contributed to Berkeley.
  44  *
  45  * All advertising materials mentioning features or use of this software
  46  * must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Lawrence Berkeley Laboratories.
  49  *
  50  * Redistribution and use in source and binary forms, with or without
  51  * modification, are permitted provided that the following conditions
  52  * are met:
  53  * 1. Redistributions of source code must retain the above copyright
  54  *    notice, this list of conditions and the following disclaimer.
  55  * 2. Redistributions in binary form must reproduce the above copyright
  56  *    notice, this list of conditions and the following disclaimer in the
  57  *    documentation and/or other materials provided with the distribution.
  58  * 3. Neither the name of the University nor the names of its contributors
  59  *    may be used to endorse or promote products derived from this software
  60  *    without specific prior written permission.
  61  *
  62  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  63  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  64  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  65  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  66  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  67  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  68  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  69  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  70  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  71  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  72  * SUCH DAMAGE.
  73  *
  74  * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp  (LBL)
  75  *
  76  *      @(#)subr_autoconf.c     8.3 (Berkeley) 5/17/94
  77  */
  78
  79 #include <sys/cdefs.h>
  80 __KERNEL_RCSID(0, "$NetBSD: subr_evcnt.c,v 1.5 2009/03/21 13:06:39 ad Exp $");
  81
  82 #include <sys/param.h>
  83 #include <sys/device.h>
  84 #include <sys/mutex.h>
  85 #include <sys/systm.h>
  86
  87 /* list of all events */
  88 struct evcntlist allevents = TAILQ_HEAD_INITIALIZER(allevents);
  89 static kmutex_t evmtx;
  90
  91 /*
  92  * We need a dummy object to stuff into the evcnt link set to
  93  * ensure that there always is at least one object in the set.
  94  */
  95 static struct evcnt dummy_static_evcnt;
  96 __link_set_add_bss(evcnts, dummy_static_evcnt);
  97
  98 /*
  99  * Initialize event counters.  This does the attach procedure for
 100  * each of the static event counters in the "evcnts" link set.
 101  */
 102 void
 103 evcnt_init(void)
 104 {
 105         __link_set_decl(evcnts, struct evcnt);
 106         struct evcnt * const *evp;
 107
 108         mutex_init(&evmtx, MUTEX_DEFAULT, IPL_NONE);
 109
 110         __link_set_foreach(evp, evcnts) {
 111                 if (*evp == &dummy_static_evcnt)
 112                         continue;
 113                 evcnt_attach_static(*evp);
 114         }
 115 }
 116
 117 /*
 118  * Attach a statically-initialized event.  The type and string pointers
 119  * are already set up.
 120  */
 121 void
 122 evcnt_attach_static(struct evcnt *ev)
 123 {
 124         int len;
 125
 126         len = strlen(ev->ev_group);
 127 #ifdef DIAGNOSTIC
 128         if (len >= EVCNT_STRING_MAX)            /* ..._MAX includes NUL */
 129                 panic("evcnt_attach_static: group length (%s)", ev->ev_group);
 130 #endif
 131         ev->ev_grouplen = len;
 132
 133         len = strlen(ev->ev_name);
 134 #ifdef DIAGNOSTIC
 135         if (len >= EVCNT_STRING_MAX)            /* ..._MAX includes NUL */
 136                 panic("evcnt_attach_static: name length (%s)", ev->ev_name);
 137 #endif
 138         ev->ev_namelen = len;
 139
 140         mutex_enter(&evmtx);
 141         TAILQ_INSERT_TAIL(&allevents, ev, ev_list);
 142         mutex_exit(&evmtx);
 143 }
 144
 145 /*
 146  * Attach a dynamically-initialized event.  Zero it, set up the type
 147  * and string pointers and then act like it was statically initialized.
 148  */
 149 void
 150 evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent,
 151     const char *group, const char *name)
 152 {
 153
 154         memset(ev, 0, sizeof *ev);
 155         ev->ev_type = type;
 156         ev->ev_parent = parent;
 157         ev->ev_group = group;
 158         ev->ev_name = name;
 159         evcnt_attach_static(ev);
 160 }
 161
 162 /*
 163  * Detach an event.
 164  */
 165 void
 166 evcnt_detach(struct evcnt *ev)
 167 {
 168
 169         mutex_enter(&evmtx);
 170         TAILQ_REMOVE(&allevents, ev, ev_list);
 171         mutex_exit(&evmtx);
 172 }